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package common
import (
"fmt"
"io"
"github.com/crate-crypto/go-ipa/bandersnatch/fr"
"github.com/crate-crypto/go-ipa/banderwagon"
)
// VectorLength is the number of elements in the vector. This value is fixed.
// Note that this means that the degree of the polynomial is one less than this value.
const VectorLength = 256
// Returns powers of x from 0 to degree-1
// <1, x, x^2, x^3, x^4,...,x^(degree-1)>
// TODO This method is used in two places; one is to evaluate a polynomial (test), and the other is to
// TODO compute powers of challenges.
// TODO the first one we can use the bls package for
// TODO The second we _could_ just multiply on each iteration, (depends on how readable it is)
func PowersOf(x fr.Element, degree int) []fr.Element {
result := make([]fr.Element, degree)
result[0] = fr.One()
for i := 1; i < degree; i++ {
result[i].Mul(&result[i-1], &x)
}
return result
}
func ReadPoint(r io.Reader) (*banderwagon.Element, error) {
var x = make([]byte, 32)
if _, err := io.ReadAtLeast(r, x, 32); err != nil {
return nil, fmt.Errorf("reading x coordinate: %w", err)
}
var p = &banderwagon.Element{}
if err := p.SetBytes(x); err != nil {
return nil, fmt.Errorf("deserializing point: %w", err)
}
return p, nil
}
func ReadScalar(r io.Reader) (*fr.Element, error) {
var x = make([]byte, 32)
if _, err := io.ReadAtLeast(r, x, 32); err != nil {
return nil, fmt.Errorf("reading scalar: %w", err)
}
var scalar = &fr.Element{}
if _, err := scalar.SetBytesLECanonical(x); err != nil {
return nil, fmt.Errorf("deserializing scalar: %s", err)
}
return scalar, nil
}
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